Fans in amp box

[Black Truck 10 10+ year member]

I am needing to throw a few fans in my amp box in my truck. What is the best way to power them? I am at frys electronics and the guy wanted me using a power invertor then a computer power supply then run the fans off that and thats well over 100 bucks.

Is there a better solution than that using relays? I have 1 open 4 awg wire from my battery I can use as power. everything else from there I need help!

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